UNS S31803

HuaNickel UNS S31803 is an austenitic-ferritic duplex stainless steel with excellent corrosion resistance and strength characteristics. Compared with SUS 316L and HuaNickel SUS 317L, it has better local corrosion resistance and can be used in complete chemical equipment and seawater desalination equipment.

UNS S31803Chemical composition：

	C	Si	Mn	P	S	Ni	Cr	Mo	N
Min	–	–	–	–	–	4.5	2	2.5	0.08
Max	0.03	1	2	0.03	0.02	6.5	23	3.5	0.2

UNS S31803Physical properties：

Specific heat(J/kg･K)		460
Resistivity(μΩ･cm)		87.0
Thermal conductivity(W/m･K)		13.9
Average coefficient of thermal expansion(10-6/℃)	20–100℃	12.7
	20–200℃	13.1
	20–300℃	13.5
	20–400℃	13.8
Longitudinal modulus of elasticity(MPa)		19.5 x  10^4
Ferromagnetic		Yes
Melting point(℃)		1420-1465

UNS S31803Mechanical properties：

0.2%Yield strength(N/mm2)	Tensile strength (N/mm2)	Elongation (%)	Hardness
≧ 450	≧ 655	≧ 25	(Hv)	(HB)
			―	―

UNS S31803 Alloy properties：

Corrosion Resistance:

Steel	Critical point corrosion temperature(℃)	Critical crevice corrosion temperature (℃)
S31803	50	25
SUS 316L	10	0℃hereinafter

Acid Corrosion Resistance:

Steel	Test conditions
	Sulfuric acid 80°C						Hydrochloric acid 80°C
	5%	10%	20%	40%	60%	80%	0.1%	1%	2%	3%
S31803	< 0.1	0.1	3.3	250.5	263.1	90.4	< 0.1	< 0.1	19	51.5
SUS316L	1.1	2.9	20.1	291.3	72.0	11.1	< 0.1	2.5	6.7	13.5